Cell Theory & Microscopes Flashcards
(15 cards)
What are the three main partsof the cell theory?
- All living thingsare made of one or more cells. 2, cells are the basic units of structure & function in living things. 3.all cells come from preexisting cells.
Schleiden (1838) cell theory
All organisms are made of cells
Schwann (1839) cell theory
All plants & animals come from cells
Who proposed that cells come from pre-existing cells?
Rudolf Virchow (1855)
What is biogenesis?
The idea that life comes from pre existing life
What is abiogenesis?
The outdated theory that life can come from non- living matter
What type of microscope uses light & lenses to magnify images?
Compound light microscope
What is a stereoscopic microscope?
Gives a 3D view of large specimens; insects. Used for dissections
Which election microscope is used to view the surface of specimens in 3D?
Scanning electron microscope (sem)
Which electron microscope is used to view internal cell structures in 2D?
Transmission electron microscope (tem)
Which microscope can Inge surfaces at the atomic level?
Scanning tunnelling microscope (STM)
What microscope uses losers & computers to create sharp 3D images fluorescent-stained cells?
Confocal laser scanning microscope
How to calculate total magnification on a compound microscope?
Multiply eyepiece by the objective lens magnification
What is contrast in microscopy?
The ability to distinguish structures in a specimen, based on differences in light intensity or colour,
What is resolution in microscopy?
The ability to distinguish two close points as separate; higher resolution gives more image detail
